自定義日期選擇器與UIPickerView每個月的第一天總是星期一

我需要創建一個自定義datepicker其中第一列顯示日期名稱，日期編號和第二列顯示月份名稱和年份。自定義日期選擇器與UIPickerView每個月的第一天總是星期一

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當月的偉大工程，但每個月的一個月第一天永遠是星期一。

#pragma Pickerview 

-(void)initilazePickerview 
{ 

    //set our picker array data 
    self.yearAndMonth = [[NSMutableArray alloc] init]; 
    self.day= [[NSMutableArray alloc] init]; 
    self.backendYearAndMonth= [[NSMutableArray alloc] init]; 
    self.backendDay= [[NSMutableArray alloc] init]; 

    /* 
    next 12 months after current month 
    */ 

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDate   *today   = [NSDate date]; 
    NSCalendar  *currentCalendar = [NSCalendar currentCalendar]; 

    NSDateComponents *monthComponents = [currentCalendar components:NSMonthCalendarUnit fromDate:today]; 
    int currentMonth = [monthComponents month]; 

    NSDateComponents *yearComponents = [currentCalendar components:NSYearCalendarUnit fromDate:today]; 
    int currentYear = [yearComponents year]; 
    int nextYear  = currentYear + 1; 

    int months = 1; 
    int year; 
    for(int m = currentMonth-1; months <= 12; m++){ 

     int nextMonth = m % 12; 

     if(nextMonth < currentMonth-1){ 
      year = nextYear; 
     } else { 
      year = currentYear; 
     } 

     //NSLog(@"%@ %i",[[dateFormatter shortMonthSymbols] objectAtIndex: nextMonth],year); 
     NSString *populateYearAndMonth=[NSString stringWithFormat:@"%@ %i",[[dateFormatter shortMonthSymbols] objectAtIndex: nextMonth],year]; 
     [self.yearAndMonth addObject:populateYearAndMonth]; 

     //save year and month in array 
     NSMutableDictionary *saveYearMonth= [[NSMutableDictionary alloc] init]; 
     [saveYearMonth setObject:[NSNumber numberWithInt:nextMonth] forKey:@"month"]; 
     [saveYearMonth setObject:[NSNumber numberWithInt:year] forKey:@"year"]; 
     [self.backendYearAndMonth addObject:saveYearMonth]; 

     months++; 
    } 
    [self populateDays:currentMonth-1 year:currentYear]; 

} 
-(void) populateDays:(int) populateMonth year:(int) populateYear 
{ 

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDate   *today   = [NSDate date]; 
    NSCalendar  *currentCalendar = [NSCalendar currentCalendar]; 

    NSDateComponents *monthComponents = [currentCalendar components:NSMonthCalendarUnit fromDate:today]; 
    int currentMonth = [monthComponents month]; 


    if (populateMonth==currentMonth-1) { 
     NSLog(@"Today"); 
     [self.day addObject:@"Today"]; 
     [self.backendDay addObject:today]; 

     NSRange days = [currentCalendar rangeOfUnit:NSDayCalendarUnit 
           inUnit:NSMonthCalendarUnit 
           forDate:today]; 
     NSLog(@"days.length = %i",days.length); 


     NSDateComponents *dayComponents = [currentCalendar components:NSDayCalendarUnit fromDate:today]; 
     int currentDay = [dayComponents day]; 

     for (int i=currentDay+1; i<=days.length; i++) { 
      int daySymbol=i%7; 
      NSString *populateDay=[NSString stringWithFormat:@"%@ %i",[[dateFormatter shortWeekdaySymbols] objectAtIndex: daySymbol],i]; 
      [self.day addObject:populateDay]; 

     } 

    } 
    else 
    { 
     NSDateComponents* comps = [[NSDateComponents alloc] init]; 

     // Set your month here 
     [comps setMonth:populateMonth+1]; 

     NSRange days = [currentCalendar rangeOfUnit:NSDayCalendarUnit 
              inUnit:NSMonthCalendarUnit 
              forDate:[currentCalendar dateFromComponents:comps]]; 
     NSLog(@"days.length = %i",days.length); 


     NSDateComponents *dayComponents = [currentCalendar components:NSDayCalendarUnit fromDate:[currentCalendar dateFromComponents:comps]]; 
     int currentDay = [dayComponents day]; 

     for (int i=currentDay; i<=days.length; i++) { 
      int daySymbol=i%7; 
      NSString *populateDay=[NSString stringWithFormat:@"%@ %i",[[dateFormatter shortWeekdaySymbols] objectAtIndex: daySymbol],i]; 
      [self.day addObject:populateDay]; 

     } 


    } 

    [self.myCustomPicker reloadComponent:0]; 
} 
    - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { 

    if (component == 1) 
    { 
     [self.day removeAllObjects]; 
     [self.backendDay removeAllObjects]; 
     NSDictionary *dataDict= [self.backendYearAndMonth objectAtIndex:row]; 
     int month=[[dataDict objectForKey:@"month"]intValue]; 
     int year=[[dataDict objectForKey:@"year"]intValue]; 
     [self populateDays:month year:year]; 

    } 
} 
// returns the number of 'columns' to display. 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ 

    NSInteger result = 0; 
    if ([pickerView isEqual:self.myCustomPicker]){ 
     result = 2; 
    } 
    return result; 
} 

// returns the number of rows in each component.. 
- (NSInteger)pickerView:(UIPickerView *)pickerView 
numberOfRowsInComponent:(NSInteger)component{ 

    NSInteger result = 0; 
    if ([pickerView isEqual:self.myCustomPicker]){ 
     switch (component) { 
      case 0: 
       result = [self.day count]; 
       break; 
      case 1: 
       result = [self.yearAndMonth count]; 
       break; 

      default: 
       break; 
     } 
    } 
    return result; 

} 

//return a plain NSString to display the row for the component. 
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row 
      forComponent:(NSInteger)component{ 
    NSString *result = nil; 
    if ([pickerView isEqual:self.myCustomPicker]){ 
     switch (component) { 
      case 0: 
       result = [self.day objectAtIndex:row]; 
       break; 
      case 1: 
       result = [self.yearAndMonth objectAtIndex:row]; 
       break; 

      default: 
       break; 
     } 

    } 
    return result; 
}

任何建議來解決這個問題？ Thanks Space，

來源

2013-07-22 u.gen

我最終得到從日曆月的第一天，建一個月就可以了，不是最好的解決辦法，但它的工作原理

-(void) populateDays:(int) populateMonth year:(int) populateYear 
{ 

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDate   *today   = [NSDate date]; 
    NSCalendar  *currentCalendar = [NSCalendar currentCalendar]; 

    NSDateComponents *monthComponents = [currentCalendar components:NSMonthCalendarUnit fromDate:today]; 
    int currentMonth = [monthComponents month]; 


    if (populateMonth==currentMonth-1) { 
     NSLog(@"Today"); 
     [self.day addObject:@"Today"]; 
     [self.backendDay removeAllObjects]; 
     [self.backendDay addObject:today]; 

     NSRange days = [currentCalendar rangeOfUnit:NSDayCalendarUnit 
           inUnit:NSMonthCalendarUnit 
           forDate:today]; 
     NSLog(@"days.length = %i",days.length); 


     NSDateComponents *dayComponents = [currentCalendar components:NSDayCalendarUnit fromDate:today]; 
     int currentDay = [dayComponents day]; 

     for (int i=currentDay+1; i<=days.length; i++) { 
      int daySymbol=i%7; 
      NSString *populateDay=[NSString stringWithFormat:@"%@ %i",[[dateFormatter shortWeekdaySymbols] objectAtIndex: daySymbol],i]; 
      [self.day addObject:populateDay]; 

      NSString *dateString =[NSString stringWithFormat:@"%d-%d-%d",populateYear,populateMonth+1,i]; 
      NSLog(@"dateString %@",dateString); 
      NSDateFormatter *dateFormatterForLoop = [[NSDateFormatter alloc] init]; 
      // this is imporant - we set our input date format to match our input string 
      // if format doesn't match you'll get nil from your string, so be careful 
      [dateFormatterForLoop setDateFormat:@"yyyy-MM-dd"]; 
      NSDate *dateFromString = [[NSDate alloc] init]; 
      // voila! 
      dateFromString = [dateFormatterForLoop dateFromString:dateString]; 
      NSLog(@"dateFromString %@",dateFromString); 
      //asdsadadd 
      [self.backendDay addObject:dateFromString]; 

     } 

    } 
    else 
    { 

     // Set your month here 
     [monthComponents setMonth:populateMonth+1]; 

     NSRange days = [currentCalendar rangeOfUnit:NSDayCalendarUnit 
              inUnit:NSMonthCalendarUnit 
              forDate:[currentCalendar dateFromComponents:monthComponents]]; 
     NSLog(@"days.length = %i",days.length); 


     NSString *dateString =[NSString stringWithFormat:@"%d-%d-01",populateYear,populateMonth+1]; 
     NSLog(@"dateString %@",dateString); 
     NSDateFormatter *dateFormatterForLoop = [[NSDateFormatter alloc] init]; 
     [dateFormatterForLoop setTimeStyle:NSDateFormatterNoStyle]; 
     [dateFormatterForLoop setDateFormat:@"yyyy-MM-dd"]; 
     NSDate *dateFromString = [[NSDate alloc] init]; 
     dateFromString = [dateFormatterForLoop dateFromString:dateString]; 

     //NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
     NSDateComponents *comps = [currentCalendar components:NSWeekdayCalendarUnit fromDate:dateFromString]; 
     int weekday = [comps weekday]; 
     NSLog(@"First Day is %i",weekday); 

     [self.backendDay removeAllObjects]; 
     for (int i=1; i<=days.length; i++) { 

      int daySymbol=(i+weekday-2)%7; 
      NSString *populateDay=[NSString stringWithFormat:@"%@ %i",[[dateFormatter shortWeekdaySymbols] objectAtIndex: daySymbol],i]; 
      [self.day addObject:populateDay]; 

      NSString *dateStringBack =[NSString stringWithFormat:@"%d-%d-%d",populateYear,populateMonth+1,i]; 
      NSLog(@"dateStringBack %@",dateStringBack); 
      NSDateFormatter *dateFormatterForLoopBack = [[NSDateFormatter alloc] init]; 
      [dateFormatterForLoopBack setTimeStyle:NSDateFormatterNoStyle]; 
      [dateFormatterForLoopBack setDateFormat:@"yyyy-MM-dd"]; 
      NSDate *dateFromStringBack = [[NSDate alloc] init]; 
      dateFromStringBack = [dateFormatterForLoopBack dateFromString:dateStringBack]; 
      [self.backendDay addObject:dateFromStringBack]; 
     } 


    } 

    [self.myCustomPicker reloadComponent:0]; 
}

來源

2013-07-23 13:14:35

試着改變NSDateFormatter的本地化。

例如，

NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"]; 
_dateFormatter = [[NSDateFormatter alloc] init];

將定位爲德國的日期格式。嘗試查找您的國家並對其進行本地化（如果您想強制在特定位置工作而不是設備設置）。

來源

2013-07-22 13:33:19

您需要在第二個組件更改時重新加載第一個組件。

來源

2013-07-22 13:33:55 Cyrille

選擇器視圖組件，沒有日期部分，很明顯。 – Cyrille

我已經在'（void）pickerView：（UIPickerView *）pickerView didSelectRow：（NSInteger）row inComponent：（NSInteger）component'我已經添加了pickerview委託的整個代碼 –

自定義日期選擇器與UIPickerView每個月的第一天總是星期一

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